I wish you all the best in your efforts to purchase this Goffin. First you need to scour the internet on Goffin prices so you can know whether or not you are paying way too much. I did a quick Google search and saw some older Goffins for sale at around $400-$500. Let the store owner know you have done your homework and know the going prices.

If it were me, I'd ask the petstore owner if the bird has had a complete medical workup by a avian vet and could I see a copy of the results. Most likely he hasn't had a workup. Then I would tell the owner it is going to cost $200 or so for all the tests the bird should have done and I want the price reduced by $200. I'd also get a written guarantee that I can return the bird after the vet visit if there are extreme medical issues.

If the pet store owner continues to try to hold the bird hostage for a ridiculous sale price, you could complain that the bird is not kept in proper size cage, etc and you are going to contact the local humane society and file a complaint. Now that may either make the store owner want to give you the bird for a good price or it may piss him off and you are back to square one. Whatever, I hope you prevail and this little guy gets a good home. Let us know what happens.